 -What is meant by weak gravitational lensing?. -Weak gravitational lensing While the presence of any mass bends the path of light passing near it, this effect rarely produces the giant arcs and multiple images associated with strong gravitational lensing.. -why is it important to understand weak gravitational lensing?. -Most lines of sight in the universe are thoroughly in the weak lensing regime, in which the deflection is impossible to detect in a single background source.. -Are there any other interesting aspects about this article?. -However, even in these cases, the presence of the foreground mass can be detected, by way of a systematic alignment of background sources around the lensing mass.. -how does one detect a foreground mass?. -Weak gravitational lensing is thus an intrinsically statistical measurement, but it provides a way to measure the masses of astronomical objects without requiring assumptions about their composition or dynamical state.. -what are some examples of the effects of gravitational lensing?. -Gravitational lensing acts as a coordinate transformation that distorts the images of background objects (usually galaxies) near a foreground mass.. -what are the major effects of gravitational lensing?. -
The transformation can be split into two terms, the convergence and shear.